Sand-grading apparatus.



J. WILLIS.

SAND GRADING APPARATUS.

APPLICATION FILED NOV. 15, 1916 1,%46,2Q2. Patented Nov. 13, 1917.

NlTNESSES INVENTOR' 20 sand to the grinding table'as to most efiecpump and made of any suitalfleiconstrue UNITE STATES PATENT OFFICE.

JOHN wlnnisl, or KANE, PENNSYLVANIA, ASSIGNOR T0 AMERICAN PLATE GLASS cont- PANY, or KANE, PENNSYLVANIA, A CORPORATION on NEW JERSEY.

SAND-GRADING ArrAnAa Us.

To all whom it may concern:

Be it knownthatLJoHN WILLIS, a citizen of the United States, residing at Kane, in thecounty of McKean and Stateof Pennsylvania, have invented certain new and. useful Improvements in Sand-Grading Appation also has in view to effect an economy in the sand, avoiding any unnecessary loss, and

reducing the costoi the process carried out by the apparatus'to a minimum. Another 0 ject of the invention is toso apply the tively secure reduction. of the surface to a substantial plane in condition ready for the polishing operation, in the shortest time.

Referring to the drawings illustrating the invention :-Fi re 1 is'a view in sectlon'al elevation showing the apparatus as applied to a sand grinding table.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is a detail plan view showing the adjustable terminal of the abrasive conducting pipe leading into the first of the five sand hoppers Fig. 4 is a similar view showing a modified arrangement for changingthe circulation.

mounted in the usual way and in connection with the rotatable runners 3, 5, I having the customary raising and lower itig mechanism not. herein shown. Located adjacent to the table and extending downwardly to any desired depth below it, is a mainsump pit 4 viding the pit into a primary ch: her a and a secondary chamber '6. A gutt r 6 collects the over-flow from table 2 and by a channel 7 deposits all of the collected ivater and abrasive into the upper portion- (if chamber a of sump pit 4, any overflow passing off from the top to the sewer by a cdnduit 8.

A pump 9, which is preferably, a rotary tion, is provided with an intake onnection 10 extending through the partiti 11 5 into Specification of Letters Patent; a puauon filed November is; 1916. Serial No. 131,401

-14 1a and '14.

Thesandgrinding table 2 is; rotatably Patented Nov. 13, 1917.

chamber a and a conduit 11 leads from pump 9 in chamber Z2 upwardly over across the table, conduit 11 is provided with a delivery.

terminal 12, preferably adjustable for de' livery nto a return conduit 13. or into'the first of a series of settling compartments 14 Conduit 13, on the other and, may itself be adjustable so as to be shifted over, by its receivin 13, into register with the'de ivery terminal 12 or away from it, as will be readily understood. Adjust-abilityof conduit 12 is madeby using the-usual elbow or other suitable plpe fittings as shown.

The several settling compartments 14, 1t,

. 14 and 14 are of any suitable construction but preferably hopper-shaped, terminating in diminlshed tapering'deliv'ery bottom por a suitable pump 17 having a delivery pipe 18 leading over to the distributing trough 19 above and between'the runners, into which the pipe 13 also discharges.

As shown, the settling chambers or hoppers 14, 14 14" and 14 are provided with an inner wall 14 which closely approximates the curvature of the main grinding table, providing for economical installation, while also securing the desirable successive wideningofthe several hoppers toward the endmost overflow outlet. y

In operation, a charge of coarse sand is first deposited in chamber-a of the sump pit with an ample supply of water, and the pump 9 is put into operation, carrying the coarse sand upwardly by conduit ll to determinal box,

'tions, with each of which is connected :1

ed. After such operation is continued for 405 a suilicier t length of time known as the coarse grinding the sand now reduced to more or less fine form, is delivered into the first compartment 14 of the series of settling compartments and is collected in each comhaving therreturn' pipe 21. 'Any surplus BEST AVAlLABLE cow in suspension over 'toward the overflow 20 water" and useless slimjes or other 'waste ma:

terialiare. carried off to these'wer either by overflow or by-defiectingpipe 21ito a; sewer connection. The remaining useful sandslare deposited by precipitation into the several collecting compartments 14, 14, 14* and 14"- respectively. Commencing with the coarser of the-fine sand in the first compartment, and by means of pump 17? and its'connections above described, the first grade of fine sand is used and the next finer grades are successively used andapplied to the'table, the operation being continued until thefinest sandhas been applied -when the grinding operation is ordina ily finished and the is ready for the finishingoperation It-is not essential, in carrying out "the above 1 described operation that theioriginalbatch of coarse sand be maintained to the exclusion of any additional sand; as fresh coarse sand may fbeesupplieilfrom time to l i j time to the compartmentmof the su pit depending uponitheilreiiuirements for :the' coarse giindingfl Also from time tojwtnne.

the conduit l3'may be used to deposit anyof so r partments and the, operations of grinding the finer grades of'sand 'inthe settling coma a and settling may occur simultaneously or intermittently when desired;

The present invention is similar in certain. respects to mylpriorapjplicationifiled Oct.

at 1: claim is? a 1. In combination with a glass grinding l table, .a main sumppit adapted to, receive the overtlmv therefrom and to receive fresh abraslve at its upper end, means forremov- "iug Icoarseabrasive and waterfrom the sump pit and'l iavingf a conduit aclaptedgto beput in connection with a'conduit leadingfback to the table or with as ettling compartment,

a cQ actin conduit;loadingiback tothetable,

a serieso' grading compartments adapted: to

receive abrasive and Water; from thefsump pit conduit and to" collect the abrasive n [varying gradesby precl 'utation and provided u ith aterm inal nvqrflow, a pump; a condu t connected with sa d pump and "with the bottom of eachjof thc gradlngfcornpartfromtho tables inlfaln'asive at its upperf u same to thotuble; a return conduit leading w at ror i \vith,:i glass grinding,

table, a: slnnp plt adapted to rvr zolvc overflow signature. j,

back} to'the o table-and; pump adapted to ta e abrasiveend water from the sump pit and provided with aterminal adapted to be put into-communication with-said return conduit with the ef said" settling compartments} -3. In jcombinationwith a glass grinding table, a sump pit adapted to receive overflow from'theltable'and abrasiveat its upper pore tion, a series ois'ettling compartments, and "meansfor withdrawingthe contents of each compartment separately andldelivering the 1 same to the' table; a" return conduitjleading back to the table and provided'with' a mov-l ablereceiving terminaly'and a pump adapted to'takej abrasive and water from the sump pit and ,provi'dedwith a terminal adapted topbeyjputlintoicommunication with said receiving terminal orwith the first of said set tlingcompartments.

4;. ln combiination with :a .glass grindin table, a sump" pit adaptedto receive overflow from thfltableandabrasive at its upper portion,' a seriesof's'ettling compartments, and I means"forwithdrawin'g the contents of each compartment separately and delivering the samefyto' the table; areturn conduit leading back to the table and provided with a receiving terminal, apumpradaptedto take abrasive andfwaterfrom the sump pit provided with a delivery conduit one of said conduits beingafdjustable whereby the. pump conduit is adapted; to be put-into communication with" thei'terminal of'said return conduit or with the; first of said settling compartments.

5. ;In,c0mbinationwith a glass grinding tablejai dal conduit adapted to deliver abrasive and waterto the. table; a sump pit adaptedto receive overflow from the table and abrasive, atitsupper portion, a pump titioned therefiom, and'a pump v1n said comdirect communication with: the return con- "duit' leading back to the table. Y

"compartmntadjacent thesump pitand par- 6. Incomhinatmnwith'a circular glass grinding; table, a single chamber collecting sump spit; lm eansl for removing the contents of thesump, p'it warm: delivering the same back to ftheitable or to the firstjoffla series of settlinggcompartments a series of such p e compartments having an'outerlstraight wall ments. and a delivery pipe leading from the and an inner wall; dlvergingv 'therefrom and substantially l conformin tothe curvature of the table;

lntestimony whereof hereunto ,afiix my 

